Add Rust icons based on the official raster versions

[aerkiaga]

Instead of using the SVG artwork as in #983, here I attempt a different method, namely tracing over the PNG images and exporting the result as SVG.

[danirabbit]

Hey thanks for your contribution! I just responded to the original issue report. Sorry I know it's not what you're hoping to hear!

Hey thanks for your suggestion. I'm really reluctant to add even more programming language file types. I think we are already supporting too many, especially because a lot of these logos don't look good at small sizes.

I think I would rather have some generic programming language icons that are like "compiled language", "interpreted language", "markup language" and then symlink to these more generic icons. It's unlikely you'll mix programming languages in the same project so it's probably just more useful to figure out like which is a class file and which is like styles or xml or whatever

Gonna close as "Design conflict" since I want to reduce the number of programming language icons rather than expand it